Across the world cultures have made it a habit of canning their favorite foods, sometimes in curious ways. Grass jelly, Vietnam: You can get it as canned chunks of jelly, or even as an energy drink. Grass jelly, or leaf jelly, is popular in across Asia, particularly in Vietnam, China, Indonesia and Malaysia. The pressed juice from a combination of three regional plants is apparently high in nutrients and very sweet. Flickr/SeaTurtle

Reindeer meat, Finland: While reindeer may be a staple and acceptable food source in Finland, there's still no good reason the meat should be canned indefinitely. Canned reindeer is also controversial because of its questionably traumatic harvesting process of acquiring the meat. Flickr/SydesJokes

Canned huitlacoche, Mexico: This parasitic fungus that infects corn is widely popular for its unique earthiness and complex flavors. A quick look at the canned version, however, will probably remind you of the ick factor. Ranker/Mark

Bird's nest drink, Asia: Edible birds' nests have been used in Chinese cooking for more than 400 years and can be one of the most expensive food products. When dissolved in water, these swift nests have a slightly gelatinous quality that can be flavored sweet or salty. Still, that's no reason it should be turned into an energy drink. Flickr/TravellingMcmahans

Toothy herring, Russia: It's hard to tell if you would eat this food, or if it would eat you! Russian herring is basically stewed fish heads with the sharp teeth intact .. chew with caution. englishrussia.com

Powdered horse milk, Russia: Horse milk is widely consumed in Russia and Mongolia. Still, note that in a powdered version, it's actually freeze-dried and though it is 100% horse milk (note: no ponies), it is technically also 91% water. Flickr/FridayFunStuffl

Canned haggis, Scotland: Haggis is a bit of an acquired taste to begin with. So why not put it in a can too? Flickr/yougonnaeatthat.com

Barbecue silkworm pupae, Korea, Thailand: Fried silkworm pupae are popular across Asia, usually skewered and deep-fried or grilled. They also have very little of their own taste so are usually heavily spiced. The trick is to bite down hard on the outer pupae shell until the gooey insides come squirting out — these canned versions come in a handy barbecue sauce. Ranker/Mark

All Day Breakfast, U.K.: Baked beans, tomato sauce, eggs, sausages, mushrooms, chopped pork ... it's all your favorite things about a full British breakfast fry-up, but in a can. I'll repeat: a full British fry-up in a can! I rest my case. Flickr/JonathanHarford